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- W2367652680 abstract "Research purposes: Originating is one of key links of the successful construction of tunnel in city.This paper researches the method of earth reinforcement,installation of guide rail,installation and check calculation for reaction force system so as to select the reasonable parameters of preliminary boring and guarantee the construction quality.Research conclusions:(1) The foundation of the originating tunnel portal was reinforced withφ1 000 triple tube high-pressure churning jet pile and the boring earth core for sampling with proportion of 0.5%-1% was conducted.The unconfined compression strength tested in the experiment was more than 0.8 MPa and it could ensure the earth stability.(2) The portal originating guide-rail was installed in the originating tunnel portal to avoid the appearance of knotow of shield machine because the cutter head of the shield machine was hanging while the shield machine was originating.(3) The pressure of earth chamber was bigger than that of earth ahead.In this way,the knotow of the shield machine after the machine disengaging from the originating base and the over-big ground subsidence were avoided.(4) The safety of the originating process of shield was ensured though the check and calculation of the mechanics of the reaction shelf." @default.
- W2367652680 created "2016-06-24" @default.
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- W2367652680 date "2010-01-01" @default.
- W2367652680 modified "2023-09-28" @default.
- W2367652680 title "Technology for Originating Construction of Shield Tunnel in Soft Soil Stratum in Shanghai" @default.
- W2367652680 hasPublicationYear "2010" @default.
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